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put the ski on the ground, put your boot on top and look at the midsole line, move it back and forth and measure untill you find the mounting point with the most flat area under foot, i've been finding most pairs coming out at +2 to +4 depending on boot soul length. i recomend this method for all mountain riders. you'll have to ask somebody elseif it is more park orianted your going for. i've mounted about 30 pairs over last year and this with lots of feed back.